Unified chair seat and back



FIG. 1 is a front view of our new design;

FIG. 2 is a left side view of our new design, with the right side being a mirror image of the left side.

FIG. 3 is a top view of our new design;

FIG. 4 is a bottom view of our new design; and,

FIG. 5 is a perspective view of our new design. 

The ornamental design for a unified chair seat and back, as shown and described. 